N-(5,6-Dichloro-1,4-dihydro-2-quinazolinyl)-2,3-dihydroxypropanamide 2,2,2-trifluoroacetate (1:1), is an intermediate for the synthesis of 3-Hydroxy Anagrelide (H798300), a major metabolite of Anagrelide (A637300), an antithrombotic.